Re: Offloading to use Guile-SSH instead of lsh

[Efraim Flashner <efraim@flashner.co.il>]

[-- Attachment #1: Type: text/plain, Size: 1882 bytes --]

On Sat, Nov 05, 2016 at 04:41:41PM +0100, Ludovic Courtès wrote:
> Hello!
> 
> The ‘wip-guile-ssh’ branch is finally getting into shape.  As soon as
> a new Guile-SSH release is out, I’ll merge it on master.
> 
> The goal of this branch is to use Guile-SSH (libssh bindings) instead of
> invoking ‘lsh’ when offloading builds (see
> <https://www.gnu.org/software/guix/manual/html_node/Daemon-Offload-Setup.html>
> for background.)
> 
> The new code is shorter(!), more efficient, more elegant, and hopefully
> more reliable.  The efficiency gains come from the fact that we can
> reuse SSH sessions in an intelligent way.  The elegance has to do with
> the fact that we have direct access to the SSH API, as opposed to
> invoking ‘lsh’ and checking its exit status.
> 
> Improved reliability (well, modulo new bugs ;-)) comes from the fact
> that we open a direct connection to the remote guix-daemon for the
> duration of the offload, which allows us to better control GC root
> registration—we can use the ‘add-temp-root’ RPC directly instead of
> writing indirect root files in $HOME.
> 
> Before we put it in production on hydra.gnu.org :-), I’d welcome more
> testing!  To do that you need a current Guile-SSH (with the
> ‘channel-send-eof!’  procedure), and the ‘build-machine’ form is
> slightly different than before: it has a new ‘host-key’ field to contain
> the OpenSSH-formatted host key of the machine.  I’ve updated the doc to
> reflect that.
> 
> Feedback welcome!
> 
> Ludo’.
> 

So to clarify, I need to switch just the master to the wip-guile-ssh
branch, or also the slaves?

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
GPG key = A28B F40C 3E55 1372 662D  14F7 41AA E7DC CA3D 8351
Confidentiality cannot be guaranteed on emails sent or received unencrypted

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 801 bytes --]